harbach-electronics fm-202 User Manual

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(1) Fan Motor with Leads
(1) 3½” Fan Blade
(2) Blue W ire Nuts
(1) Long Shank 3/32” Hex Wrench
(2) 8-32 x ½” Screws
(2) 3/8” Rubbe r Grom me ts
(2) #8 S houlder W ashers

To start the installation, read these instructions very carefully.  You will n eed a ¼ ” drill bit

and a narrow  screw driver at least 4” long. Unplug the amplifier and remove any input, output and
control cables that may be connected to the back of the amplifier.  Remove the chassis from the
case.  Remove the perforated sheet metal shield from the top of the chassis and remove the tubes.
Place the tubes  whe re they will not be dam aged.  Y ou are now read y to procee d with  the
installation.

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Drill a ¼ ” hole in the left side of the tube compartment 5¾” inches from the rear of the
chassis and about 3/16” up from the under side of the chassis.  This will be the screwdriver
access hole for the fan blade setscrew.

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If you have not unpacked the motor and fan blade, do so now.

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Cut the 2 black fan power wires.  Cut them near the motor winding.

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W ith the am plifier right side up, bend the fan blades up until you find the setscrew in the fan
hub.

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Put your narrow screwdriver through the hole you drilled and remove the fan blade by
unscrewing the setscrew.

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Remove the (2) 10-32 screws that attach the fan m otor to the chassis and discard them,
along with any washers.

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Remove and discard the 2 rubber grommets that padded the motor mounting screws.
Clean any debris out of thee holes.

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Install the new rubber grom me ts in the m otor m ounting holes. 

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Pass 1 of the 8-32 x ½” screws through a shoulder washer.  The shoulder of the washer
should face away from the screw head.

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Set the new  fan motor in place with its mounting holes aligned with the holes in the rubber
grommets.

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Pas s the screw th rough  the grom met into the ad apter block on the fan m otor.

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In a like manne r, repea t for the other 8-32 x ½ ” screw and shoulder washer.